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| 型號： | BT865AKPF |
| 英文描述： | Color Encoder Circuit |
| 中文描述： | 顏色編碼器電路 |
| 文件頁數(shù)： | 35/76頁 |
| 文件大?。?/td> | 1050K |
| 代理商： | BT865AKPF |
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Bt864A/865A
1.0 Circuit Description
YCrCb to NTSC/PAL Digital Video Encoder
1.8 Closed Captioning
100138B
Conexant
1-25
1.8 Closed Captioning
The Bt864A/865A encodes NTSC/PAL
–
M closed captioning on scan line 21 and
NTSC/PAL
–
M extended data services on scan line 284. Four 8-bit registers
(CCF1B1, CCF1B2, CCF2B1, and CCF2B2) provide the data while bits
ECCF1and ECCF2 enable display of the data. A logical zero corresponds to the
blanking level of 0 IRE, while a logical one corresponds to 50 IRE above the
blanking level.
Closed captioning for PAL
–
B, D, G, H, I, N, Nc is similar to that for NTSC.
Closed caption encoding is performed for 625-line systems according to the
system proposed by the National Captioning Institute; clock and data timing is
identical to that of NTSC system, except that encoding is provided on lines 22
and 335.
The Bt864A/865A generates the clock run-in and appropriate timing
automatically. Pixel inputs are ignored during CC encoding. See FCC Code of
Federal Regulations (CFR) 47 Section 15.119 (10/91 edition or later) for
programming information. EIA608 describes ancillary data applications for
FIELD 2 Line 21 (line 284).
When CCF1B2 is written, CCSTAT1 is set; when CCF2B2 is written
CCSTAT2 is set (CCSTAT1 and CCSTAT2 are defined in
Table 2-1
). After the
closed-caption bytes for FIELD 1 are encoded, CCSTAT1 is cleared; after the
closed-caption bytes for FIELD 2 are encoded, CCSTAT2 is cleared. If the
ECCGATE bit is set, no further encoding will be performed until the appropriate
registers are again written; a NULL with odd parity will be transmitted on the
appropriate closed caption line in that case. User must set the odd parity bit. If the
ECCGATE bit is not set, the user must rewrite the closed-caption registers prior to
reaching the closed-caption line, otherwise the last bytes will be re-encoded.
Closed-caption will override EVBI inserted data on lines 21 and 284 for
525-line formats, and lines 22 and 335 for 625-line formats. Closed-caption will
be overridden by teletext if teletext is enabled on these lines.
Closed caption data registers are double buffered and can be loaded without
the risk of corrupting data as it is being encoded onto the appropriate video line
(line 21 or 284 for 525-line formats, line 22 or 335 for 625-line formats).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| BT865AKRF | 制造商:CONEXANT 制造商全稱:CONEXANT 功能描述:YCrCb to NTSC/PAL Digital Video Encoder |
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| BT866KPJ | 制造商:BT 功能描述:Video/TV Circuit, Color Encoder Circuit, 68 Pin, Plastic, PLCC 制造商:Burns and Towne Inc 功能描述:Video/TV Circuit, Color Encoder Circuit, 68 Pin, Plastic, PLCC |
| BT867KPF | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Color Encoder Circuit |
| BT867KPJ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Color Encoder Circuit |
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